/*
 * @Description: 
 * @Author: Zilu
 * @Date: 2021-11-04 19:12:34
 * @Version: 
 * @LastEditTime: 2021-11-04 19:13:35
 * @LastEditors: Zilu
 */
// echo_eof.c --重复输入，直到文件结尾
#include <stdio.h>

int main(int argc, char const *argv[])
{
    int ch;

    while ((ch = getchar()) != EOF)
        putchar(ch);

    return 0;
}

